Node.js is an open source, cross-platform runtime environment for server-side and networking applications. Node.js® is a platform built on Chrome’s JavaScript runtime for easily building fast, scalable network applications. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices.
The creator of Node.js originally had the goal of creating Web sites with push capabilities such as those seen in Gmail. After trying solutions in several other programming languages, he chose JavaScript because of the lack of an existing I/O API. This allowed him to define a convention of asynchronous, event-driven I/O. Node.js applications are designed to maximize throughput and efficiency, using non-blocking I/O and asynchronous events. It is commonly used for real-time web applications due to its asynchronous nature. Node.js internally uses the Google V8 JavaScript engine to execute code, and a large percentage of the basic modules are written in JavaScript. Node.js contains a built-in asynchronous I/O library for file, socket, and HTTP communication, which allows applications to act as a Web server without software such as Apache HTTP Server or IIS.
What’s Node.js v7.0.0
This new major version of Node.js includes: V8 5.4 which brings along with 98% coverage of ES6 language features, improved reliability and performance, and a new experimental URL parser based on the WHATWG URL standard.
As an odd numbered release, in accordance with Node.js Long Term Support plan, Node.js v7 will be supported only until about June, 2017, with Node.js v8 currently scheduled for release in April, 2017.
The general rule for deciding which version of Node.js to use is:
- Stay on Node.js v4 or upgrade to Node.js v6 if you need stability and have a complex production environment, e.g. you are a medium or large enterprise.
- Upgrade to Node.js v7 if you have the ability to upgrade versions quickly and easily without disrupting your environment and want to play with the latest features as they arrive.
Notable changes
- Buffer
- Passing invalid input to Buffer.byteLength will now throw an error #8946.
- Calling Buffer without new is now deprecated and will emit a process warning #8169.
- Passing a negative number to allocUnsafe will now throw an error #7079.
- Child Process
- The fork and execFile methods now have stronger argument validation #7399.
- Cluster
- The worker.suicide method is deprecated and will emit a process warning #3747.
- Deps
- V8 has been updated to 5.4.500.36 #8317, #8852, #9253.
- NODE_MODULE_VERSION has been updated to 51 #8808.
- File System
- A process warning is emitted if a callback is not passed to async file system methods #7897.
- Intl
- Intl.v8BreakIterator constructor has been deprecated and will emit a process warning #8908.
- Promises
- Unhandled Promise rejections have been deprecated and will emit a process warning #8217.
- Punycode
- The
punycodemodule has been deprecated #7941.
- The
- URL
- An Experimental WHATWG URL Parser has been introduced #7448.
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